Vulnerability Discussion
In addition to auditing new user and group accounts, these watches will alert the system administrator(s) to any modifications. Any unexpected users, groups, or modifications must be investigated for legitimacy.
Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000062-GPOS-00031, SRG-OS-000304-GPOS-00121, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000470-GPOS-00214, SRG-OS-000471-GPOS-00215, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000466-GPOS-00210, SRG-OS-000476-GPOS-00221
Check
Verify RHEL 9 generates audit records for all account creations, modifications, disabling, and termination events that affect "/etc/group" with the following command:
$ sudo auditctl -l | egrep '(/etc/group)'
-w /etc/group -p wa -k identity
If the command does not return a line, or the line is commented out, this is a finding.
Fix
Configure RHEL 9 to generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/group".
Add or update the following file system rule to "/etc/audit/rules.d/audit.rules":
-w /etc/group -p wa -k identity
The audit daemon must be restarted for the changes to take effect.